1021120020 has 144 divisors (see below), whose sum is σ = 3234329280. Its totient is φ = 270418176.

The previous prime is 1021120013. The next prime is 1021120031. The reversal of 1021120020 is 200211201.

1021120020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1021119984 and 1021120011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 791536 + ... + 792824.

It is an arithmetic number, because the mean of its divisors is an integer number (22460620).

Almost surely, 2^1021120020 is an apocalyptic number.

1021120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021120020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1617164640).

1021120020 is an abundant number, since it is smaller than the sum of its proper divisors (2213209260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021120020 is a wasteful number, since it uses less digits than its factorization.

1021120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476 (or 1462 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1021120020 is about 31954.9686277424. The cubic root of 1021120020 is about 1006.9910184341.

Adding to 1021120020 its reverse (200211201), we get a palindrome (1221331221).

The spelling of 1021120020 in words is "one billion, twenty-one million, one hundred twenty thousand, twenty".